I endorse listening to
Brother Peter Diamond of
Most Holy Family Monastery at
Vatican Catholic dot com

He is a sedevacantist and shows how the mainstream ultra montane Catholic Church is a hoax

Unfortunately he still holds the heretical ultra montane position and claims that some pope is infallible just not that pope

He is valuable because he shows that a specific organization is a scam

Unfortunately he fails to show that other organizations like the one he supports are also scams